Process for the preparation of fluorine-containing ketones
AssigneeHoechst Aktiengesellschaft
InventorsThomas Martini, Friedhelm Kluge
Life of this patent
Estimating the term…
Abstract
Perfluorocarboxylic acid salts of a monovalent metal are reacted with perfluorocarboxylic acid fluorides in aprotic polar solvents. Perfluoroketones are obtained. The salt of the perfluorocarboxylic acid can be replaced by alkali metal salts of formic acid, oxalic acid or of oxygen-containing mineral acids, the central atom of which is an element of the groups IIIA to VIIA of the periodic table and which mineral acid is weaker than trifluoroacetic acid. The same result is obtained if the anhydride of the perfluorocarboxylic acid is contacted with an alkali metal fluoride. The synthesized perfluoroketones are liquids of high chemical and thermal stability.
Claims4
A process for the preparation of aliphatic perfluoroketones, which comprises reacting a perfluorocarboxylic acid salt of the formula
- R.sub.1 - CO.sub.2 M II
- wherein M is a metal selected from the group consisting of Li, Na, K, Rb, Cs, Ag and R.sub.1 is a perfluoroalkyl radical having of from 2 to 50 carbon atoms, which radical may contain in addition one or more ether oxygen linkages, with a perfluorocarboxylic acid fluoride of the formula
- R.sub.2 - COF III
- wherein R.sub.2 is a perfluoroalkyl radical having of from 1 to 50 carbon atoms, which radical may contain in addition one or more ether oxygen linkages, in an aprotic-polar solvent at a temperature of from 20.degree. to 200.degree. C. to form a ketone of the formula R.sub.2 COR.sub.3 wherein R.sub.3 is selected from R.sub.1 and isomers of R.sub.1.
Dependencies are inferred from the claim text.